Sewage tank



FIG. 1 is a perspective view of a sewage tank in accordance with the newdesign;

FIG. 2 is a front elevational view thereof; a rear elevational viewbeing a mirror image thereof;

FIG. 3 is a right side elevational view thereof; and,

FIG. 4 is a left side elevational view thereof.

The broken lines in the drawings are for illustrative purposes only andform no part of the claimed design.

The ornamental design for a sewage tank, as shown and described.